From Wiktionary, the free dictionary
dar em (first-person singular present dou em, first-person singular preterite dei em, past participle dado em)
- Used other than figuratively or idiomatically: see dar, em.
- to get into (to behave uncharacteristically)
Começou a chorar do for no reason. O que deu nele?- He began to cry suddenly. What has gotten into him?
- to result in
Não vai dar em nada.- Nothing will happen.